Convert number array to string array

Question

How from array with numbers:

a = [4,1,3]

make array:

s = ["****","*","***"]

So each number corresponds to amount of stars in a cell

This question doesn't show any effort on the OP's part to attempt to learn how to answer the question himself. The question asks for a coding solution but does not clearly specify what language to use other than in the tags. If this should be posted at all, it might be more appropriate at http://codegolf.stackexchange.com/ — mkrufky, Jun 11 '16 at 19:27
Lack of effort is not a valid close reason. For that reason, I'm voting to leave open. See also [A Close Vote Is Not a Super Downvote](http://meta.gamedev.stackexchange.com/questions/2115/a-close-vote-is-not-a-super-downvote) — Wayne Conrad, Jun 11 '16 at 22:25

score 4 · Accepted Answer · edited Jun 11 '16 at 16:25

4

You can use map like so:

a = [4,1,3]
s = a.map { |count| '*' * count }
#=> ["****", "*", "***"]

edited Jun 11 '16 at 16:25

spickermann

answered Jun 11 '16 at 16:15

Surya

It can also be written as `a.map(&?*.method(:*))` (see http://stackoverflow.com/questions/23695653/can-you-supply-arguments-to-the-mapmethod-syntax-in-ruby) – Mladen Jablanović Jun 11 '16 at 16:48
1

@MladenJablanović : Yes, it can be. However, it will look a bit complicated to someone who is new to Ruby. As it will require explanation of `?*` which will be char string and then calling multiplication method within `map` which would be applied on the element/value on a particular iteration. So, keeping it simple. Thank you for the link anyway. – Surya Jun 11 '16 at 18:23

score 0 · Answer 2 · answered Jun 11 '16 at 18:50

0

If you are okay with array contents being replaced, then, following will do it:

a.fill {|i|  "*" * a[i]}
#=> ["****", "*", "***"]

answered Jun 11 '16 at 18:50

Wand Maker

2 Answers2